/*
 *  Copyright (C) 2013-2014 Ofer Kashayov <oferkv@live.com>
 *  This file is part of Phototonic Image Viewer.
 *
 *  Phototonic is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Phototonic is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Phototonic.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "fstree.h"

bool FSModel::hasChildren(const QModelIndex &parent) const
{
    if (parent.column() > 0)
    {
        return false;
    }

    if (!parent.isValid()) // drives
    {
        return true;
    }

    // return false if item cant have children
    if (parent.flags() &  Qt::ItemNeverHasChildren)
    {
        return false;
    }

    // return if at least one child exists
    return QDirIterator(filePath(parent), filter() | QDir::NoDotAndDotDot, QDirIterator::NoIteratorFlags).hasNext();
}

FSTree::FSTree(QWidget *parent)
    : QTreeView(parent)
{
    setAcceptDrops(true);
    setDragEnabled(true);
    setDragDropMode(QAbstractItemView::InternalMove);

    fsModel = new FSModel();
    fsModel->setRootPath("");
    setModelFlags();

    setModel(fsModel);

    for (int i = 1; i <= 3; ++i)
    {
        hideColumn(i);
    }

    setHeaderHidden(true);

    connect(this, SIGNAL(expanded(const QModelIndex &)),
            this, SLOT(resizeTreeColumn(const QModelIndex &)));
    connect(this, SIGNAL(collapsed(const QModelIndex &)),
            this, SLOT(resizeTreeColumn(const QModelIndex &)));
}

QModelIndex FSTree::getCurrentIndex()
{
    return selectedIndexes().first();
}

void FSTree::resizeTreeColumn(const QModelIndex &)
{
    resizeColumnToContents(0);
}

void FSTree::dragEnterEvent(QDragEnterEvent *event)
{
    QModelIndexList selectedDirs = selectionModel()->selectedRows();

    if (selectedDirs.size() > 0)
    {
        dndOrigSelection = selectedDirs[0];
        event->acceptProposedAction();
    }
}

void FSTree::dragMoveEvent(QDragMoveEvent *event)
{
    setCurrentIndex(indexAt(event->pos()));
}

void FSTree::dropEvent(QDropEvent *event)
{
    if (event->source())
    {
        QString fstreeStr="FSTree";
        bool dirOp = (event->source()->metaObject()->className() == fstreeStr);
        emit dropOp(event->keyboardModifiers(), dirOp, event->mimeData()->urls().at(0).toLocalFile());
        setCurrentIndex(dndOrigSelection);
    }
}

void FSTree::setModelFlags()
{
    fsModel->setFilter(QDir::AllDirs | QDir::NoDotAndDotDot);

    if (GData::showHiddenFiles)
    {
        fsModel->setFilter(fsModel->filter() | QDir::Hidden);
    }
}

